Uplink Listening Timing Control for LTE Unlicensed Spectrum
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Solution Overview
Problem
In LTE systems using unlicensed spectrum, the timing of uplink listening for interference control can be inappropriate, leading to decreased system throughput and frequency use efficiency due to dependencies on the configuration of preceding downlink subframes.
Innovation Solution
A user terminal is equipped with a transmission section, reception section, and control section that dynamically adjusts the timing of uplink listening based on received timing information, allowing for appropriate execution of listening operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If uplink listening is performed based on the configuration of the immediately preceding downlink subframe, then the listening timing is determined, but the system throughput and frequency use efficiency decrease due to inappropriate timing
Solution Approach 1:
The patent applies dynamics by making the listening timing adjustable rather than fixed. The terminal can dynamically select from multiple predetermined timing options (first timing, second timing, third timing) based on actual communication conditions, allowing the listening moment to adapt to different downlink subframe configurations and achieve both appropriate timing and high throughput.
Solution Approach 2:
The patent changes the timing parameter of uplink listening from a fixed value to multiple predetermined values. By providing the terminal with a selection of timing options and allowing it to choose based on the downlink subframe configuration, the system optimizes both timing appropriateness and frequency use efficiency simultaneously.
2Ease of operation
If uplink listening timing is fixed based on downlink subframe configuration, then the control is simple, but the frequency use efficiency decreases due to suboptimal timing
Solution Approach 1:
The patent changes the timing parameter from a single fixed value to multiple predetermined values. This allows the terminal to select the optimal timing based on actual conditions while maintaining relatively simple control through predefined options, thereby improving frequency use efficiency without excessive operational complexity.
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple timing options before the actual listening operation. The terminal can select from these predetermined timings (first, second, third timing) based on the downlink subframe configuration, ensuring optimal frequency use while keeping the control mechanism straightforward through advance preparation.
3Loss of time
If multiple timing options are provided for uplink listening, then the frequency use efficiency improves, but the device complexity increases due to timing selection control
Solution Approach 1:
The patent changes the timing parameter to multiple predetermined values, which improves frequency use efficiency. The control complexity is managed by providing clear selection criteria based on downlink subframe configuration, making the multi-option system manageable and not excessively complex.
Solution Approach 2:
The patent applies feedback by using the downlink subframe configuration information to determine the appropriate uplink listening timing. The terminal receives feedback about the downlink configuration and uses this information to select the correct timing option, creating a closed-loop control that manages complexity through information-based decision making.
Data Source
AI summary
To perform listening for uplink transmission at an appropriate timing, on a carrier with setting of listening. A user terminal according to an aspect of the present invention has a transmission section that transmits a signal on a carrier where a listening is performed prior to uplink transmission, a reception section that receives timing information, and a control section that controls execution timing of the listening, on the basis of the timing information.